feat: setup wizard page for first-deploy initialization

- SetupWizardPage: step-by-step config (DB, admin, project)
- Connects directly to AbstractWizard via SSH tunnel (127.0.0.1)
- App.tsx: detect backend health, show wizard if not ready
- Auto-switch wizard to readonly after setup
- Add VITE_WIZARD_PORT build arg
- Add vite-env.d.ts for type safety

Dockerfile

@@ -5,7 +5,9 @@ COPY package.json package-lock.json* ./
 RUN npm install
 COPY . .
 ARG VITE_API_BASE=/api
+ARG VITE_WIZARD_PORT=18080
 ENV VITE_API_BASE=$VITE_API_BASE
+ENV VITE_WIZARD_PORT=$VITE_WIZARD_PORT
 RUN npm run build
 
 # Production stage — lightweight static server, no nginx